Abstract
Electrochemical conversion of carbon dioxide to carbon and oxygen is studied in LiF-Li2CO3 eutectic molten salt under a carbon dioxide atmosphere using a molybdenum cathode and an inert platinum anode at 700°C. Chronoamperometric measurements show that the electrodeposition of carbon involves three-dimensional (3D) instantaneous nucleation under diffusion-controlled growth at 700°C. Carbon coating occurs at the molybdenum cathode through the electrochemical reduction of carbonate ions, and is tested at different cathodic potentials (−0.65 to −1.05 V) in LiF-Li2CO3 eutectic molten salts at 700°C. Scanning electron microscope images reveal that smooth, dense, and compact deposits are obtained at more positive cathodic potentials. Raman spectroscopic analysis confirms that the carbon ID/IG peak ratio was 1.48, suggesting a slight degree of graphitization. Cyclic voltammetry indicates that potential for oxygen evolution at the platinum electrode is at around 0.5 V vs. platinum. Gas chromatography showed that oxygen gas is generated at the platinum inert electrode during potentiostatic electrolysis at 0.8 V and 1.0 V vs. platinum. This proposed concept may be used to provide oxygen in a carbon dioxide-rich environment such as the Martian surface.
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